In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: skip netdev events generated on netns removal
syzbot reported following (harmless) WARN:
WARNING: CPU: 1 PID: 2648 at net/netfilter/core.c:468 nft_netdev_unregister_hooks net/netfilter/nf_tables_api.c:230 [inline] nf_tables_unregister_hook include/net/netfilter/nf_tables.h:1090 [inline] __nft_release_basechain+0x138/0x640 net/netfilter/nf_tables_api.c:9524 nft_netdev_event net/netfilter/nft_chain_filter.c:351 [inline] nf_tables_netdev_event+0x521/0x8a0 net/netfilter/nft_chain_filter.c:382
reproducer: unshare -n bash -c 'ip link add br0 type bridge; nft add table netdev t ; \ nft add chain netdev t ingress \{ type filter hook ingress device "br0" \ priority 0\; policy drop\; \}'
Problem is that when netns device exit hooks create the UNREGISTER event, the .pre_exit hook for nf_tables core has already removed the base hook. Notifier attempts to do this again.
The need to do base hook unregister unconditionally was needed in the past, because notifier was last stage where reg->dev dereference was safe.
Now that nf_tables does the hook removal in .pre_exit, this isn't needed anymore.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 22, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 22, 2024 |
| Suse | — | Upgrade gfs2-kmp-rtUpgrade dtb-lgUpgrade kernel-azure-optionalUpgrade gfs2-kmp-azureUpgrade kernel-kvmsmallUpgrade kernel-default-vdsoUpgrade kernel-source-azureUpgrade dtb-mediatekUpgrade dtb-alteraUpgrade cluster-md-kmp-azureUpgrade kernel-obs-buildUpgrade kernel-zfcpdumpUpgrade kernel-azure-livepatch-develUpgrade dtb-caviumUpgrade kernel-default-extraUpgrade kernel-develUpgrade kernel-sourceUpgrade kernel-azure-develUpgrade ocfs2-kmp-defaultUpgrade kernel-rt-livepatchUpgrade dtb-xilinxUpgrade kernel-debug-vdsoUpgrade kernel-devel-rtUpgrade kernel-rt-develUpgrade kernel-rt_debug-develUpgrade dlm-kmp-64kbUpgrade dtb-armUpgrade kernel-obs-qaUpgrade cluster-md-kmp-rtUpgrade kernel-kvmsmall-develUpgrade ocfs2-kmp-rtUpgrade dtb-apmUpgrade kernel-rtUpgrade dtb-nvidiaUpgrade dtb-rockchipUpgrade dtb-allwinnerUpgrade kernel-default-optionalUpgrade kernel-rt-extraUpgrade kselftests-kmp-64kbUpgrade dtb-exynosUpgrade dtb-qcomUpgrade kernel-syms-azureUpgrade kernel-source-vanillaUpgrade kernel-macrosUpgrade kernel-azureUpgrade kernel-default-base-rebuildUpgrade dtb-amlogicUpgrade reiserfs-kmp-azureUpgrade kernel-devel-azureUpgrade dlm-kmp-defaultUpgrade dtb-marvellUpgrade dtb-hisiliconUpgrade dlm-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-source-rtUpgrade dtb-renesasUpgrade dtb-amdUpgrade kernel-rt-vdsoUpgrade kernel-debug-livepatch-develUpgrade kernel-debug-develUpgrade kselftests-kmp-azureUpgrade kselftests-kmp-rtUpgrade ocfs2-kmp-azureUpgrade kernel-docsUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debugUpgrade dlm-kmp-azureUpgrade kernel-symsUpgrade kernel-docs-htmlUpgrade kernel-64kb-extraUpgrade kernel-kvmsmall-livepatch-develUpgrade dtb-broadcomUpgrade dtb-amazonUpgrade kernel-azure-vdsoUpgrade dtb-socionextUpgrade cluster-md-kmp-64kbUpgrade gfs2-kmp-defaultUpgrade kernel-default-develUpgrade kernel-default-livepatchUpgrade kernel-rt-optionalUpgrade ocfs2-kmp-64kbUpgrade kernel-rt-livepatch-develUpgrade kernel-default-baseUpgrade kernel-defaultUpgrade reiserfs-kmp-defaultUpgrade gfs2-kmp-64kbUpgrade reiserfs-kmp-rtUpgrade kernel-rt_debug-vdsoUpgrade dtb-appleUpgrade kernel-debugUpgrade kernel-64kb-livepatch-develUpgrade kernel-64kbUpgrade dtb-sprdUpgrade dtb-freescaleUpgrade kernel-64kb-optionalUpgrade kernel-default-livepatch-develUpgrade cluster-md-kmp-defaultUpgrade reiserfs-kmp-64kbUpgrade kernel-kvmsmall-vdsoUpgrade kernel-64kb-develUpgrade kernel-syms-rtUpgrade kernel-azure-extra | Aug 9, 2024 | May 22, 2024 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | May 22, 2024 |
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